⚡ Earthquake Swarm Alert: 13 Earthquakes in San Ramon

Swarm Overview

An earthquake swarm has been detected in the San Ramon area.

What is an Earthquake Swarm?

An earthquake swarm is a sequence of many earthquakes occurring in the same area over a relatively short period, without a clear mainshock-aftershock pattern. Unlike typical earthquake sequences, swarms don't have a single large earthquake followed by smaller aftershocks - instead, the earthquakes are more similar in size.

The Calaveras Fault Connection

The San Ramon area is located along the Calaveras Fault, which is known for producing earthquake swarms. The San Ramon/Danville area experiences noticeable swarm activity every few years. While these swarms can be unsettling, they typically consist of small earthquakes that cause no damage.

Recent Activity

• M1.4 - Feb 5, 6:58 AM

• M1.4 - Feb 5, 6:32 AM

• M1.1 - Feb 5, 4:08 AM

• M1.3 - Feb 5, 4:04 AM

• M1.5 - Feb 5, 1:06 AM

• M2.2 - Feb 4, 7:48 PM

• M1.5 - Feb 4, 7:15 PM

• M1.6 - Feb 4, 6:42 PM

• M1.8 - Feb 4, 6:34 PM

• M1.1 - Feb 4, 5:06 PM

*...and 4 more earthquakes*

Should You Be Concerned?

Most earthquakes in this swarm are too small to feel. Earthquake swarms are a normal part of seismic activity in the Bay Area and do not necessarily indicate a larger earthquake is coming. However, they're a good reminder to stay prepared.

Stay Updated

• View live earthquake map →
• Report felt earthquakes →
• Earthquake preparedness guide →